What role does world-building play in DC reaction fanfiction?

World-building is crucial for a believable experience. Writers often incorporate established DC lore and details about cities like Gotham and Metropolis. They may also create new scenarios or expand upon existing storylines, adding unique elements to the DC universe. Consistent attention to the rules of the DC world - like power levels, technology, and history - is important, even if the story deviates from canonical events.